In Australia for an emergency we call 000. Even if your plan has expired on your mobile phone, or you don't even have a SIM in your phone, you can still call 000.
The European emergency call number is 112. My first mobile phone in the nineties could not call 000, the Australian emergency call number, only 112, and as an incentive to upgrade the phone to enable it to call 000 I was offered a new and nicer aerial for my phone. I travelled by a couple of trains to Laburnum Station where the business was and the business gave me the new aerial and fixed the phone so it could call 000. R picked me up as he worked nearby and we went to Box Hill and had an early dinner at a Chinese restaurant called Sunny Court. The restaurant served pho before pho had a name in Australia.
The sister of Victoria's former Premier Ted Ballieu, one Kate Ballieu, now a heritage activist on the Mornington Peninsular, recounted in her The Age newspaper column of her experience when her neighbour's terrace row house in North Melbourne caught fire, and she dialled 999, the English emergency call number. Yes, if you were a young person and read a lot of books written by English people, 999 might have been at the fore of your mind.
Before I stopped watching American tv shows, there was a show about an emergency service. I can't recall the name of the show, maybe something like Dial 911. Goodness, I can almost recall the hot actor in the show. I should know his name. From that show I learnt that 911 is the number to call in the US. Sorry US peeps. I don't think 911 will work here and I don't think the British 999 will either.
000 works and so does the international 112.
What do more minor countries use? What a nightmare of a hotch potch. There are too many to list. Even New Zealand uses a different number, 111. Generally 112 is the number to try first if you don't know. Phone systems in different countries may automatically redirect the call to the local number.
The world can't get its act together on weights and measures, digital and analogue broadcasting systems, copyright, not even date format. It's a wonder we can even send a letter to another country. What hope is there for a standard international emergency number.